JPH0456495A - Television receiver - Google Patents

Abstract

PURPOSE:To control the color shift of a picture accompanying the turn of a television receiver by providing a means driving a degausser corresponding to the turn angle of the main body of the television receiver. CONSTITUTION:The main body of the television receiver turns and stops by a turning and lifting device, and after the lapse of prescribed time which the turn angle takes to exceed a prescribed value, a second relay 15 besides a first relay 12 start operation and a series circuit 16 starts operation, then the resistance value of a positive characteristic thermistor 14 gradually rises, and the magnetization in a CRT by the influence of a geomagnetism is eliminated. Before the reversion of this thermistor 14, the main body of the television receiver again turns over the prescribed angle then stops, next a third relay 18 starts operation and a series circuit 19 starts operation, then the resistance value of a positive characteristic thermistor 17 gradually rises, and the magnetization in the CRT by the influence of the geomagnetism is similarly eliminated. Therefore, it is possible to control the generation of the color slippage of the picture even if turning the main body of the television receiver.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a receiver that suppresses color shift.

(b) Prior Art CRT receivers generally have a built-in degaussing coil to prevent color shift in images due to the influence of earth's magnetism. By passing an alternating current that decays over time through this degaussing coil, color shift can be suppressed.

Incidentally, recently it has been proposed to make such a receiver rotatable and use it for monitoring a home automation system (see Japanese Patent Application No. 1-214584).

However, in this case, although color blurring occurs in the image due to the influence of the earth's magnetic field as the vehicle rotates, it is not possible to suppress the color blurring at this time.

(/Problems to be Solved by the Visionary Invention The present invention attempts to suppress the occurrence of color shift in images due to rotation of the receiver.

(d) Means for Solving the Problems The receiver of the present invention comprises: a turning means for turning the receiver main body; a demagnetizing device; and a driving means for driving the demagnetizing device according to the turning angle of the receiver main body. Consisting of

(E) Effect When the receiver is rotated, the degaussing device is driven according to the angle of rotation.

(f) Example FIG. 1 shows the structure of a receiver according to an embodiment of the present invention.

The receiver body 1 is mounted on the ceiling 2 of a kitchen, for example, with a rotating/elevating device 3.
This allows the receiver body 1 to rotate and move up and down depending on the position of the operator. This receiver L can be used as a monitor for a home automation system or used to search for cooking menus.

FIG. 2 shows a block circuit of the receiver. A CRT 4 is built into the receiver body 1, and the CRTj is driven by a drive device 5 comprising a microcomputer to display a desired image. The driving device 5 not only drives and controls the CRT 4 but also controls the rotating/elevating device 3 and the CR.
Drive control of the degaussing device 6 etc. for T4. The λ crab to the drive device 5 is provided by a manual switch, a setting section 7 such as a light pen, and a sensor section 8 provided on the front surface of the receiver body I.

FIG. 3 shows a specific circuit of the degaussing device 6.

A first series circuit 13 including a degaussing coil 10, a first positive temperature coefficient thermistor 1, and a first relay 12 is connected to the power plug 9. In this first positive temperature coefficient thermistor 11 (a second series circuit 16 of the second positive coefficient thermistor 14 and the second relay 15, and a third series circuit of the third positive coefficient thermistor 17 and the third relay 18) 9 and a fourth series circuit 22 of a fourth positive temperature coefficient thermistor 20 and a fourth relay 21 are connected to each other.

The first relay 12 is set to C! It is activated every time T4 is used, and in this case, the first series circuit 13 is activated and the resistance value of the first positive temperature coefficient thermistor 11 gradually increases, and as a result, an alternating current that attenuates over time is applied to the degaussing coil 10. flows, and the magnetization inside the CRT 4 due to the influence of earth's magnetism is erased.

Further, when the receiver body 1 is rotated and stopped by the rotation/elevating device, the rotation angle is set to a predetermined ViC, for example, 5.
When the predetermined time required to reach −E has passed since 0 degrees),
In this case, in addition to the first relay 12, the second relay 15 is activated, and the second series circuit 16 is activated, so that the resistance value of the second positive temperature coefficient thermistor 14 gradually increases. magnetization is erased. After the operation of the second series circuit 16 is completed, the second positive temperature coefficient thermistor 1
It takes about 5 minutes for the resistance value of 4 to return to its original value and the second positive temperature coefficient thermistor 14 to be usable again.

Before the second positive temperature coefficient thermistor I4 returns, when the receiver main body turns more than a predetermined angle and stops, the third relay 18 is activated, the third series circuit 19 is activated, and the third The resistance value of the positive temperature coefficient thermistor 17 gradually increases, and the magnetization inside the CRT 4 due to the influence of earth's magnetism is similarly erased. The third positive temperature coefficient thermistor 17 also takes about 5 minutes to recover its resistance value.

Furthermore, if the receiver body 1 turns over a predetermined angle and stops before the third positive temperature coefficient thermistor 17 returns, the fourth positive coefficient thermistor 2I) will act to prevent the inside of the CRT 4 from being similarly affected by the earth's magnetic field. Magnetism is erased. The fourth positive temperature coefficient thermistor 20 also takes about 5 minutes to recover its resistance value.

Even when the receiver body 1 is rotated as shown in 2, the magnetization inside the CRT 4 is erased, thereby suppressing color shift in the CRT image.

Furthermore, even if a turn is made due to power transformation, since there are a plurality of positive temperature coefficient thermistors, color stains are similarly suppressed.

(G) Effects of the Invention According to the present invention, it is possible to significantly suppress the occurrence of color shift in images even when the receiver body is rotated, and a practical receiver can be realized.

[Brief explanation of the drawing]

The drawings relate to a receiver according to an embodiment of the present invention, and FIG. 1 is a front view;
FIG. 2 is a block circuit diagram, and FIG. 3 is a circuit diagram of the degaussing device. l...Receiver body, 3 - Swivel/elevating device, 5...
Drive device, 6... demagnetizing device.

Claims (1)

[Claims] (1) A receiver comprising a turning means for turning the receiver main body, a demagnetizing device, and a driving means for driving the demagnetizing device according to the turning angle of the receiver main body.